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...the Mariners would probably have to buy the rights to Sounders, Canucks, Blazers and Rainiers (minor league games actually get watched in Seattle, believe it or not) telecasts and start producing analysis and talk-style programming to fill out the down days.
They can show classic Mariner games and the like as well, the way the YES network does it, but they need a variety of sports to fill in the offseason.